package com.px.chapter_Dec_1;

public class RoundArea {
    double bj;
    public RoundArea(){

    }

    public RoundArea(float bj) {
        this.bj = bj;
    }
    public double roundA(){
        return 3.1415926*this.bj*this.bj;
    }
    public void setBj(int i){
        this.bj=i;
    }

    public double getBj() {
        return bj;
    }
}
